Did you use setserial with port 0 option?

setserial /dev/ttyS3 port 0


> 
> yamcfg uses obsolete (PF_INET,SOCK_PACKET)
> Trying yam1 at iobase 0x2e8 irq 3
> yam1: cannot 0x2e8 busy
> Trying yam1 at iobase 0x2e8 irq 3
> yam1: cannot 0x2e8 busy
> 

Reply via email to